So nobody brings in a hub. Unlike the media, who thinks that point to point service to everywhere is the cat's own ass, it's not tough to realize that you will get increased frequencies to everyone else's hubs and markets that can sustain p-t-p. Many, many markets live like this on a regular basis and survive.
I think it's a given that nobody else would want to hub PIT. The domestic system (the cartel's airlines, anyway) is overhubbed to begin with.
All that having been said, US has still not explained how they plan on running several hundred more RJs thru places like PHL. Operationally, it will be a disaster. Given that the current crop of cronies in the executive suite can't operate a toaster, baggage belt, or even a transatlantic route structure (see last week's FRA-PHL fun), I find it unlikely that they'll be able to pull this off.
Now, I'm curious--I did not know that US had appointed a "director of FUD operations" on the line as opposed to the executive suite.